package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList booklist) {
        System.out.println("删除图书！");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除的图书名称：");
        String name = scanner.nextLine();
        int currentSize = booklist.getUserSize();
        int delIndex = -1;
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = booklist.getBook(i);
            if(book.getName().equals(name)){
                delIndex = i;
                break;
            }
        }
        if(i == currentSize){
        System.out.println("没有你要删除的书！");
        return;
    }
        for (int j = delIndex; j < currentSize-1; j++) {
            //[j] = [j+1]
            Book book = booklist.getBook(j+1);
            booklist.setBooks(j,book);
        }

        booklist.setBooks(currentSize-1,null);

        booklist.setUserSize(currentSize-1);

        System.out.println("删除图书成功！");
    }
}
